How to execute something asynchronous

AsyncCode.cs

var taskArray = new Task[tasksCount];

for (int index = 0; index < taskArray.Length; index++)
{
    var productId = productIds[index];
    var task =  Task.Run(() => UpdatePoductStatus(productId, Status.Available));
    taskArray[index] = task;
}

Task.WaitAll(taskArray);

// UpdatePoductStatus is a method declared somewhere in the code.